- named cgroup hierarchies- cgroup hierarchies with no bound subsystems- cgroup subsystems that can be bound to multiple hierarchies

This allows more flexibility when constructing/mounting cgroupshierarchies, and allows functionality that's not tied to specificexternal resources to be made available on multiple cgroupshierarchies rather than just one.

A few simple example cgroups subsystems that are multi-bindable areincluded in the patch series.